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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dd6bd29d643a5e23efabd685f862bc98f47b7cc24c85c2338454d62c9de4d43' 
  AND token = 'KOapIs8oGR3Sl4u5D+zfQF1jUAVUIriTL//O3+Ya5j4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}